cant go wrong with either. i bought a mossy 500, but that was because i already had a 700P and wanted to branch out lol. sanded it down to get rid of the bluing (i hate bluing) and duracoated it. holds 7+1, use it for home defense and F-ing around whilst shooting with my buddies, so i wanted something that was high capacity without having to buy a mag extension like you do with the 870.
put a flashlight on it
tritium front bead
and added an aluminum extended safety button
i'd say i have $450-$475 in it including the cost of the duracoat.